US7794640B2 - Process of draping a non-crimp fabric over a forming tool - Google Patents

Process of draping a non-crimp fabric over a forming tool Download PDF

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US7794640B2
US7794640B2 US12/320,063 US32006309A US7794640B2 US 7794640 B2 US7794640 B2 US 7794640B2 US 32006309 A US32006309 A US 32006309A US 7794640 B2 US7794640 B2 US 7794640B2
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crimp fabric
thread
fusible
plies
fabric
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US20090194906A1 (en
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Michael J Healey
Raymond Johnsen
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Airbus Operations Ltd
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Airbus Operations Ltd
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
    • D04B21/16—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads
    • D04B21/165—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads with yarns stitched through one or more layers or tows, e.g. stitch-bonded fabrics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/22—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
    • B29C70/226—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure the structure comprising mainly parallel filaments interconnected by a small number of cross threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/546—Measures for feeding or distributing the matrix material in the reinforcing structure
    • B29C70/547—Measures for feeding or distributing the matrix material in the reinforcing structure using channels or porous distribution layers incorporated in or associated with the product
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/002—Inorganic yarns or filaments
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/002—Inorganic yarns or filaments
    • D04H3/004—Glass yarns or filaments
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/04—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
    • D04H3/115—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by applying or inserting filamentary binding elements
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/063—Load-responsive characteristics high strength
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2403/00—Details of fabric structure established in the fabric forming process
    • D10B2403/02—Cross-sectional features
    • D10B2403/024—Fabric incorporating additional compounds
    • D10B2403/0241—Fabric incorporating additional compounds enhancing mechanical properties
    • D10B2403/02412—Fabric incorporating additional compounds enhancing mechanical properties including several arrays of unbent yarn, e.g. multiaxial fabrics
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/02—Reinforcing materials; Prepregs

Definitions

  • the invention relates to non-crimp fabrics and is particularly concerned with non-crimp fabrics with improved drape characteristics.
  • the fabrics may be of a non-crimped or warp-knitted type.
  • the fabrics maybe unidirectional (fibres in a single orientation) or more typically multi-axial.
  • Multi-axial means that alternate plies of fibres will be constructed in several different directions to produce a fabric with optimum strength and stiffness in required directions. Commonly used directions are 0°, +45°, ⁇ 45° and 90°. Normally the 0° plies are in the warp direction and the 90° plies in the weft direction, but other layers may contain fibres at different angles, typically at 45° or ⁇ 45°.
  • Non-crimp refers to fabrics where one or multiple layers of fibres are laid upon each other and transformed into a fabric by stitching or application of a binder such that the fibres remain straight and without substantial crimp.
  • NCFs non-crimp fabrics
  • Such composites have potential for use in the production of wing skins for example.
  • the present application is concerned with non-crimp fabrics having improved drape properties.
  • the prime role of the stitching is to hold the plies of the non-crimp fabric together during handling in a predominantly un-crimped manner. However, if the density of stitches is too high or the stitching is under too much tension or too thick then disruption and crimping of the fibres may occur.
  • binder powder for pre-form manufacture using non-crimp fabrics.
  • the use of such fine powders may be hazardous as the powder may inhaled or irritate the skin of an operative.
  • a method of producing a non-crimp fabric which comprises providing a laminate of plies and stitching the plies together using a fusible thread.
  • the primary function of the stitch is to hold the fibres together during the non-crimp fabric manufacture and to aid resin infusion. Whilst the stitch initially restricts drape, the eventual fusion of the stitch overcomes that restriction.
  • fusible means that the thread not only melts by itself when heated, but may also dissolve into a resin during processing at temperature. Therefore, by using a fusible thread, the stitched plies can be heated so as to soften or melt the fusible thread so as to improve the drape of the fabric.
  • the plies are warp and weft dominated. Examples of warp and weft dominated plies are described in EP-A-0826488 to which the reader is directed for details. Fibres of each ply used in the composite may be constructed in several different directions. In the present application they are preferably 0°, +45°, ⁇ 45° and 90°, but angles of ⁇ 20° to 90° can be used on the weft orientation.
  • the non-crimp fabric may comprise from 0.5% to 10% fusible thread by mass. More preferably, the non-crimp fabric comprises from 1% to 3% fusible thread by mass.
  • the fusible thread will preferably melt at a temperature of between 40° C. to 150° C., depending on application and processing route used.
  • the fused thread may react with the curing resin or remain as a separate phase, preferably causing minimal decrease in mechanical properties and improving damage tolerance.
  • the fusible thread should have a glass transition temperature (T g ) of greater than 120° C. for aerospace applications. To balance the melting and T g temperature, some reaction between the fused stitch and resin is desirable.
  • a T g greater than 120° C. would improve hot-wet performance, especially in compression.
  • a T g of less than 120° C. may help damage tolerance.
  • the fusible thread may be constructed from one or more different materials. Where a plurality of materials is used, the threads may fuse at different temperatures or contain both fusible and infusible materials. If one material is infusible, the fibres are preferably not continuous, thus allowing movement when the fusible material melts.
  • Infusible thread materials at normal processing temperatures include: polyester, acrylamide polymers, e.g. Kevlar®, carbon, acrylonitrile polymers e.g. Panox®, or PBO.
  • Fusible thread materials may include polyamides, lower molecular weight polymers of polyethersulphone e.g. Grillon K-110 from EMS Chemie AG or blends of epoxy resins.
  • the fusible thread may be constructed from two or more different materials, each having a different fusion temperature.
  • the stitching runs substantially transversely through the plies and follows a predetermined pattern.
  • the pattern may be tricot closed, open pillar stitch, closed pillar stitch, open tricot-pillar stitch, or closed tricot-pillar stitch or variants thereof.
  • the method may also include heating the plies as aforesaid to improve the drape of the fabric.
  • the plies are heated to a temperature not greater than the fusion temperature of the thread.
  • the plies are heated to a temperature at or above the fusion temperature of the fusible thread, so that the thread fuses and allows the fabric to move. Where this occurs without the presence of a matrix resin, cooling under pressure below the fusion temperature substantially maintains the shape formed creating a pre-form, due to the fusible stitch acting as an in-situ binder.
  • Tension in the un-fused stitching tends to create channels in the non-crimp fabric which are normally undesirable.
  • the method may facilitate easier matrix resin infusion into the fabric through the channels, and then heating the fabric to a temperature above the fusion temperature of the stitching whereby the stitching fuses and relieves the tension.
  • fibres in the non-crimp fabric, which have been crimped due to tension in the stitching will move to minimise crimp, reduce resin rich areas and improve ultrasonic NDT inspection.
  • the fusible thread will preferably be chemically compatible with the matrix resin and be of a similar modulus.
  • the fusible thread may melt and remain as a separate phase from the matrix resin, dissolve in the matrix or precipitate out later as the matrix is cured or allowed to set.
  • the matrix may be a resin.
  • the fused stitching may also act as a toughening phase within resin infused non-crimp fabric. Such a secondary benefit would be normally at fusible stitch levels of 5-10% of fabric mass
  • a hairy yarn as disclosed in applicant's U.S. Pat. No. 7,456,119 and entitled ‘Composites’ may be introduced into the plies so as to improve the shear properties between the plies and improve damage tolerance.
  • FIG. 1 is a schematic cutaway view of a non-crimp fabric being stitched with a fusible thread
  • FIG. 2 is a table showing different types of stitch patterns.
  • a non-crimp fabric 10 is constructed from a laminate 12 of plies 14 a - 14 e .
  • the plies are multi-axial with fibres in respective plies 14 a to 14 e at angles of 0°, 90°, +45°, 90° and ⁇ 45° as shown in FIG. 1 .
  • a set of needles 16 is used to facilitate the stitching of the plies 12 together.
  • the needles 16 move transversely up and down through the laminate 12 in a predetermined pattern whilst the laminate is moved in a direction shown by the arrow ‘A’. Examples of predetermined stitch patterns used can be seen in FIG. 2 .
  • a fusible thread 18 for example made of Grillon K-110®, is threaded into the needles 16 .
  • the thread 18 is then stitched into the laminate 12 in the predetermined pattern.
  • the non-crimp fabric 10 can then be used to produce structural components.
  • the fabric 10 is draped over a pre-form tool to be copied (not shown), with the fabric being cut to shape first.
  • the fabric 10 may be heated to a temperature at or in excess of the fusion temperature of the thread so as to relieve some of the tension within the thread thereby improving the drape of the fabric.
  • a resin (not shown) is infused in to the non-crimped fabric 10 .
  • the resin passes through channels (not shown) resulting from tension in the stitching.
  • the fabric 10 is heated to a temperature above the fusion temperature of the thread. This causes the stitching to fuse and thereby relieve the tension.
  • fibres in the non-crimp fabric 10 which have been crimped due to tension in the stitching, can move to minimise crimp.
  • a ‘hairy yarn’ (not shown) may be used. Strands of hairy yarn are substituted for fibres within the plies 14 . The strands of hairy yarn in one ply interact with those in another thereby improving the shear strength properties of the non-crimp fabric 10 as described in the aforementioned U.S. Pat. No. 7,454,119 to which the reader is directed for full details.

Abstract

A method of producing a non-crimp fabric and a non-crimp fabric comprising a layup of fabric plies stitched together by a thread, at least part of which is fusible, is provided. The method can include heating the stitched plies to soften or melt the fusible thread. The use of fusible thread can act as an in situ binder within the non-crimp fabric and tension created by the unfused stitching may create channels for matrix resin infusion during manufacture.

Description

This application is Continuation of application Ser. No. 10/466,673, filed Jul. 28, 2003 (now abandoned) which was a U.S. national phase of International Application PCT/GB01/05673, filed 20 Dec. 2001, which designated the U.S. and claims priority to GB application 0101362.2 filed 19 Jan. 2001. The entire contents of these applications are incorporated herein by reference.
The invention relates to non-crimp fabrics and is particularly concerned with non-crimp fabrics with improved drape characteristics.
It is known to produce fabrics, by laying several plies of fibres into a stack of required thickness. The fabrics may be of a non-crimped or warp-knitted type. The fabrics maybe unidirectional (fibres in a single orientation) or more typically multi-axial. The term “Multi-axial” means that alternate plies of fibres will be constructed in several different directions to produce a fabric with optimum strength and stiffness in required directions. Commonly used directions are 0°, +45°, −45° and 90°. Normally the 0° plies are in the warp direction and the 90° plies in the weft direction, but other layers may contain fibres at different angles, typically at 45° or −45°. The term “Non-crimp” refers to fabrics where one or multiple layers of fibres are laid upon each other and transformed into a fabric by stitching or application of a binder such that the fibres remain straight and without substantial crimp. As well as offering performance advantages relative to traditional woven materials, non-crimp fabrics (NCFs) may be cheaper to produce per unit mass and be faster to manufacture. Such composites have potential for use in the production of wing skins for example.
However, as the number of layers in a non-crimped fabric blanket increases, the ability to conform to changes in shape of the component being made (drape) decreases due to the restrictions imposed by the stitching. Consequently, the drape characteristics of unidirectional and biaxial NCFs are generally comparable to that of woven fabrics whereas drape is increasingly restricted with triaxials, quadraxials, etc. hence restricting possible applications.
The present application is concerned with non-crimp fabrics having improved drape properties.
The prime role of the stitching is to hold the plies of the non-crimp fabric together during handling in a predominantly un-crimped manner. However, if the density of stitches is too high or the stitching is under too much tension or too thick then disruption and crimping of the fibres may occur.
It is also known to use a binder powder for pre-form manufacture using non-crimp fabrics. However, the use of such fine powders may be hazardous as the powder may inhaled or irritate the skin of an operative.
According to the invention there is provided a method of producing a non-crimp fabric which comprises providing a laminate of plies and stitching the plies together using a fusible thread.
In use, the primary function of the stitch is to hold the fibres together during the non-crimp fabric manufacture and to aid resin infusion. Whilst the stitch initially restricts drape, the eventual fusion of the stitch overcomes that restriction. In the present application, the term fusible means that the thread not only melts by itself when heated, but may also dissolve into a resin during processing at temperature. Therefore, by using a fusible thread, the stitched plies can be heated so as to soften or melt the fusible thread so as to improve the drape of the fabric.
Preferably, the plies are warp and weft dominated. Examples of warp and weft dominated plies are described in EP-A-0826488 to which the reader is directed for details. Fibres of each ply used in the composite may be constructed in several different directions. In the present application they are preferably 0°, +45°, −45° and 90°, but angles of ±20° to 90° can be used on the weft orientation.
The non-crimp fabric may comprise from 0.5% to 10% fusible thread by mass. More preferably, the non-crimp fabric comprises from 1% to 3% fusible thread by mass.
The fusible thread will preferably melt at a temperature of between 40° C. to 150° C., depending on application and processing route used. The fused thread may react with the curing resin or remain as a separate phase, preferably causing minimal decrease in mechanical properties and improving damage tolerance. Preferably, after curing, the fusible thread should have a glass transition temperature (Tg) of greater than 120° C. for aerospace applications. To balance the melting and Tg temperature, some reaction between the fused stitch and resin is desirable. A Tg greater than 120° C. would improve hot-wet performance, especially in compression. A Tg of less than 120° C. may help damage tolerance.
The fusible thread may be constructed from one or more different materials. Where a plurality of materials is used, the threads may fuse at different temperatures or contain both fusible and infusible materials. If one material is infusible, the fibres are preferably not continuous, thus allowing movement when the fusible material melts. Infusible thread materials at normal processing temperatures include: polyester, acrylamide polymers, e.g. Kevlar®, carbon, acrylonitrile polymers e.g. Panox®, or PBO. Fusible thread materials may include polyamides, lower molecular weight polymers of polyethersulphone e.g. Grillon K-110 from EMS Chemie AG or blends of epoxy resins.
The fusible thread may be constructed from two or more different materials, each having a different fusion temperature.
Preferably, the stitching runs substantially transversely through the plies and follows a predetermined pattern. The pattern may be tricot closed, open pillar stitch, closed pillar stitch, open tricot-pillar stitch, or closed tricot-pillar stitch or variants thereof.
The method may also include heating the plies as aforesaid to improve the drape of the fabric. In one embodiment, the plies are heated to a temperature not greater than the fusion temperature of the thread. However, in another embodiment, the plies are heated to a temperature at or above the fusion temperature of the fusible thread, so that the thread fuses and allows the fabric to move. Where this occurs without the presence of a matrix resin, cooling under pressure below the fusion temperature substantially maintains the shape formed creating a pre-form, due to the fusible stitch acting as an in-situ binder.
Tension in the un-fused stitching tends to create channels in the non-crimp fabric which are normally undesirable. However, it has been found that the method may facilitate easier matrix resin infusion into the fabric through the channels, and then heating the fabric to a temperature above the fusion temperature of the stitching whereby the stitching fuses and relieves the tension. In that way fibres in the non-crimp fabric, which have been crimped due to tension in the stitching, will move to minimise crimp, reduce resin rich areas and improve ultrasonic NDT inspection.
Where the method includes infusing the non-crimp fabric with a matrix resin, the fusible thread will preferably be chemically compatible with the matrix resin and be of a similar modulus.
The fusible thread may melt and remain as a separate phase from the matrix resin, dissolve in the matrix or precipitate out later as the matrix is cured or allowed to set.
The matrix may be a resin.
The fused stitching may also act as a toughening phase within resin infused non-crimp fabric. Such a secondary benefit would be normally at fusible stitch levels of 5-10% of fabric mass
A hairy yarn as disclosed in applicant's U.S. Pat. No. 7,456,119 and entitled ‘Composites’ may be introduced into the plies so as to improve the shear properties between the plies and improve damage tolerance.
A non-crimp fabric in accordance with the invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a schematic cutaway view of a non-crimp fabric being stitched with a fusible thread; and
FIG. 2 is a table showing different types of stitch patterns.
Referring to FIG. 1, a non-crimp fabric 10 is constructed from a laminate 12 of plies 14 a-14 e. The plies are multi-axial with fibres in respective plies 14 a to 14 e at angles of 0°, 90°, +45°, 90° and −45° as shown in FIG. 1.
A set of needles 16 is used to facilitate the stitching of the plies 12 together. The needles 16 move transversely up and down through the laminate 12 in a predetermined pattern whilst the laminate is moved in a direction shown by the arrow ‘A’. Examples of predetermined stitch patterns used can be seen in FIG. 2.
A fusible thread 18, for example made of Grillon K-110®, is threaded into the needles 16. The thread 18 is then stitched into the laminate 12 in the predetermined pattern.
The non-crimp fabric 10 can then be used to produce structural components. The fabric 10 is draped over a pre-form tool to be copied (not shown), with the fabric being cut to shape first. The fabric 10 may be heated to a temperature at or in excess of the fusion temperature of the thread so as to relieve some of the tension within the thread thereby improving the drape of the fabric.
In another embodiment of the invention, a resin (not shown) is infused in to the non-crimped fabric 10. During the infusion process the resin passes through channels (not shown) resulting from tension in the stitching. After infusion, the fabric 10 is heated to a temperature above the fusion temperature of the thread. This causes the stitching to fuse and thereby relieve the tension. As a result, fibres in the non-crimp fabric 10, which have been crimped due to tension in the stitching, can move to minimise crimp.
In still another embodiment of the invention a ‘hairy yarn’ (not shown) may be used. Strands of hairy yarn are substituted for fibres within the plies 14. The strands of hairy yarn in one ply interact with those in another thereby improving the shear strength properties of the non-crimp fabric 10 as described in the aforementioned U.S. Pat. No. 7,454,119 to which the reader is directed for full details.

Claims (27)

1. A method of draping a non-crimp fabric over a forming tool prior to resin impregnation and prior to curing of said non-crimp fabric, the method including the steps of:
providing a non crimp fabric comprising a layup of plies stitched together using a thread at least part of which is fusible at a temperature that is lower than a curing temperature of said resin;
placing the non crimp fabric on the forming tool; and
heating the non crimp fabric sufficiently to soften the fusible thread as the non crimp fabric drapes over the tool, thereby reducing the restriction to drape caused by the stitching.
2. A method according to claim 1 in which the plies are heated to a temperature not greater than the fusion temperature of the thread.
3. A method according to claim 1 in which the plies are heated to a temperature above the fusion temperature of the thread.
4. A method according to claim 3 in which pressure is applied to conform the plies to the shape of the tool and the plies are cooled, while under pressure, thereby creating a pre-form with the fused thread acting as an in situ binder within the non-crimp fabric.
5. A method according to claim 1 including creating tension in the un-fused stitching to create resin transfer channels in the non-crimp fabric.
6. A method according to claim 1 in which matrix resin is infused through the non-crimp fabric.
7. A method according to claim 5 including selecting a matrix resin which is chemically compatible with the fusible thread.
8. A method according to claim 5 including selecting a matrix resin and a fusible thread, said matrix resin when cured and said fusible thread both having a similar modulus of elasticity.
9. A method according to claim 5 in which the fusible thread remains as a separate phase from the matrix resin, dissolves in the matrix resin or precipitates out as the matrix resin is cured or allowed to set.
10. A method according to claim 5 in which the stitching is selected so that the fused stitching acts as a toughening phase within the resin infused non-crimp fabric.
11. A method according to claim 1 in which the non-crimp fabric provided comprises from 0.5% to 10% fusible thread by mass.
12. A method according to claim 11 in which the non-crimp fabric provided comprises from 1% to 3% fusible thread by mass.
13. A method according to claim 1 including melting or dissolving the fusible thread at a temperature between 40° C. and 250° C.
14. A method according to claim 1 including selecting a fusible thread with a glass transition temperature (Tg) of greater than 120° C. after curing.
15. A method according to claim 1 in which the fusible thread is constructed from two or more parts comprising different materials, each having a different fusion temperature.
16. A method according to claim 15 in which at least one of the materials from which the thread is constructed is infusible.
17. A method according to claim 16 in which the said infusible part of the thread is non-continuous.
18. A method according to claim 16 in which the said infusible part of the thread is of polyester.
19. A method according to claim 1 in which the stitching is run substantially transversely through the plies.
20. A method according to claim 19 in which the stitching is carried out in a predetermined pattern and is selected from the group consisting of: tricot closed, open pillar stitch, closed pillar stitch, open tricot-pillar stitch or closed tricot-pillar stitch.
21. A method according to claim 1 including providing a said non crimp fabric in which the plies are multi-axial.
22. A method according to claim 1 in which fibres of each ply are placed in directions of 0°, +45°, −45° and 90°.
23. A method according to claim 1 in which fibres of each ply are placed in directions of ±20° to 90°.
24. A method according to claim 1 in which a hairy yarn is introduced into the plies.
25. A method of draping a non-crimp fabric over a forming tool prior to resin impregnation and prior to curing of said non-crimp fabric, the method including the steps of:
providing a non crimp fabric comprising a layup of plies stitched together using a thread at least part of which is fusible;
placing the non crimp fabric on the forming tool;
heating the non crimp fabric sufficiently to soften the fusible thread as the non crimp fabric drapes over the tool, thereby reducing the restriction to drape caused by the stitching; and
infusing matrix resin through the non-crimp fabric.
26. A method of draping a non-crimp fabric over a forming tool according to claim 25, wherein, prior to said infusing step and after said heating step, the non-crimp fabric is cooled, removed from said forming tool and placed in a mold tool.
27. A method of creating a pre-form by draping a non-crimp fabric over a forming tool prior to resin impregnation and prior to curing of said non-crimp fabric, the method including the steps of:
providing a non crimp fabric comprising a layup of plies stitched together using a thread at least part of which is fusible;
placing the non crimp fabric on the forming tool;
heating the non crimp fabric sufficiently to soften the fusible thread as the non crimp fabric drapes over the forming tool, thereby reducing the restriction to drape caused by the stitching;
using pressure applied to the non-crimp fabric to conform the plies to the shape of the forming tool;
cooling the non-crimp fabric to a temperature below the fusible temperature of said thread; and
removing the pre-form from the forming tool.
US12/320,063 2001-01-19 2009-01-15 Process of draping a non-crimp fabric over a forming tool Expired - Fee Related US7794640B2 (en)

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US10/466,673 US20040113317A1 (en) 2001-01-19 2001-12-20 Non-crimp fabrics
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ATE343670T1 (en) 2006-11-15
US20090194906A1 (en) 2009-08-06
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US20040113317A1 (en) 2004-06-17
EP1352118A1 (en) 2003-10-15

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